Question about 1998 GMC Jimmy

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1998 GMC Jimmy SLT warm air only from heating ducts

When the vehicle is fully warmed up (coolant temp about 200Fper vehicle gauge) the air temperature from all the ducts is only warn...not hot. I have replaced the stat even thought the temp gauge indicate normal operating temperature. I have removed the the lines from the heater core and back flushed the heater core.I had very good flow throught the core. The inlet line to the core is very hot to the touch and the out let line is warn so it seem like the system is exchanging heat. All the air positions fubction properly. By this I mean in floor mode you only get air fron the floor duct. In I/P (instrument pannel) mode it blows from the I/p only and in defrost mode it only blows on the windshield.
Thanks for you time.

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  • Anonymous Mar 18, 2014

    replace thermotrat, heater core

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If you claim that your heater core is flushed properly then my bet is the temp regulator is bad.

Posted on Jan 13, 2009

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